OpenAI has agreed to acquire Promptfoo, an AI security startup focused on testing and securing large language model applications and agents, with plans to integrate its technology into OpenAI Frontier after the deal closes. OpenAI said the move is aimed at helping enterprises evaluate agent behavior, identify vulnerabilities during development, and improve oversight as AI systems gain access to business data and tools.
TL;DR
- OpenAI said it will acquire Promptfoo and fold its technology into OpenAI Frontier, its platform for building and operating AI coworkers.
- The companies said Promptfoo will remain open source and continue serving users and customers.
- OpenAI said the added capabilities are meant to help enterprises test for issues such as prompt injection, jailbreaks, data leaks, tool misuse, and out-of-policy agent behavior.
OpenAI has struck a deal to acquire Promptfoo, a startup founded in 2024 that focuses on evaluating and securing AI systems before they are deployed in production environments. TechCrunch reported the acquisition on March 9, 2026, and OpenAI confirmed that Promptfoo’s technology will be integrated into OpenAI Frontier once the transaction is finalized. Financial terms were not disclosed.
The move is tied to a growing enterprise focus on making AI agents more dependable and easier to govern. In its announcement, OpenAI said businesses increasingly need ways to test agentic systems, document their behavior, and reduce security and compliance risks before those systems are connected to internal data, external tools, or customer-facing workflows. The company said Promptfoo’s tooling is designed to help surface issues such as prompt injections, jailbreaks, data leaks, tool misuse, and policy-violating agent actions.
That makes Promptfoo a practical fit for Frontier, OpenAI’s enterprise platform for AI coworkers. OpenAI said the integration will bring stronger agentic security testing and evaluation capabilities directly into the platform, rather than asking customers to bolt them on separately. The company framed this as part of a broader effort to give enterprise users more built-in controls around reliability, safety, and traceability.
Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale, Srinivas Narayanan, CTO of B2B Applications at OpenAI, said in the company’s announcement. He added that the work helps businesses deploy secure and reliable AI applications and that OpenAI is excited to bring these capabilities directly into Frontier.
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Promptfoo, for its part, said joining OpenAI will help it expand its work around AI security at a time when agents are being connected to more real systems and higher-stakes workflows. In its own announcement, the company said it launched to help developers test AI applications systematically, then saw security testing become an increasingly important part of enterprise deployment.
According to Promptfoo, more than 350,000 developers have used its platform, about 130,000 are active each month, and teams at more than 25% of Fortune 500 companies use it. OpenAI also said Promptfoo’s tools are already used by teams across more than a quarter of the Fortune 500. Promptfoo added that it will remain open source and continue serving existing users and customers after the deal announcement.
Promptfoo co-founder and CEO Ian Webster said the company started because developers needed a practical way to secure AI systems. He added that as AI agents become more connected to real data and systems, securing and validating them is becoming more challenging and more important, and that joining OpenAI will help accelerate that work.
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